Describe the step involved in obtaining liquid oxygen from air
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Answer:
The utilization of liquid oxygen has spread rapidly into many industries, including food production, medicine and space exploration. Atmosphere (air), which is mainly composed of nitrogen, oxygen and carbon dioxide, is cooled until it reaches -200 degrees Celsius and liquefies. The liquid air undergoes a process called fractional distillation. Fractional distillation uses the different boiling points of the main elements of air. As the liquid air is heated, the elements change from liquid to gas and separate from one another.
Pump air through a filter to remove dust and other contaminants. Cool the air in stages until it reaches a temperature of -79 degrees Celsius. At this point, the carbon dioxide will become solid and drop from the cooled air, leaving nitrogen, oxygen and argon in the air.
Continue cooling the air until it reaches a temperature of -200 degrees Celsius and becomes liquid.
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